Bluetooth ELM 327 Diagnostics USB Cable Bluetooth ELM 327 Diagnostics USB Cable ELM327 Bluetooth CAN-BUS scan tool supports OBD-II protocols. It is used to read & diagnose trouble codes, clear trouble codes and detect fuel pressure and so on. Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database). Clear trouble codes and turn off the MIL ("Check Engine" light). Engine RPM, Engine RPM, Coolant Temperature, Fuel System Status, Vehicle Speed, Short Term Fuel Trim, Long Term Fuel Trim, Intake Manifold Pressure, Timing Advance, Intake Air Temperature Display current sensor data, including: Air Flow Rate, Absolute Throttle Position, Oxygen sensor voltages/associated short term fuel trims, Fuel System status, Fuel Pressure